The elastic analysis of simple rectangular grids by virtual work methods

This paper gives the results of theoretical analyses dealing with the transverse behaviour of parabolic encastre tied arches under two loading conditions. Firstly, the arches are considered with a static uniformly distributed transverse load acting (thereby simulating wind loading) and generalized results are given for transverse deflexion and bending moments. Secondly, the general problem of transverse and axial loading is considered and values of deflexion and moment are given for one specific value of axial load. The increase of initial deflexion and bending moment due to axial thrust is discussed and suitable multiplying factors derived so that these quantities can be obtained for a wide range of axial thrust. PHILIP T. A. DONALD and WILLIAM G. GODDEN

Mr. Donovan Lee (Member of Council) asked whether there was a misprint either on page 330 or in Fig 5 and whether the span of the Tocantins bridge was 465 ft or 426 ft.

Reinforced concrete structural members subjected to direct and bending stresses are in common use. The design of such members as columns with eccentric loading, arch sections and rigid frames involves the solution of cumbersome cubic and higher degree equations. A graphical method suggested below gives a simple and rapid solution. G. N. Krishnamurthy